[TASK] Implement missing delete functionality for FileReference

When working with a `FileReference` object, it is currently not
possible to delete the file reference  with the `delete()`
method, since it has never been implemented.

The `delete()` functionality can however be useful when working
manually with file references.

This change implements the missing functionality.

Resolves: #102770
Releases: main, 12.4
Change-Id: I5fd8a26f9e4b98de1a6f7553be0da6b53f3bab1b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82362


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>